Fusing as one

"He's just too strong. How is Tu Dahei this strong? It has already completely exceeded what counts as a 'rookie', right?"

"What sort of sword technique is this?"

"Let me tell you something very horrifying. Back when Tu Dahei was launching the counteroffensive on the Demon City, he was using his right hand, but now..."

"Holy shit, I wouldn't have realized it if you didn't say. Tu Dahei is actually using his left hand now?"

"Is there a difference with using the left or right hand? Isn't it just holding swords up and drawing circles?"